Former French president Sarkozy flags poll chaos risk

President Emmanuel Macron's unexpected decision to dissolve the National Assembly and call for snap legislative elections could backfire and plunge the country into chaos, former French president Nicolas Sarkozy warns.

Macron called the snap vote, to be held in two rounds on June 30 and July 7, after his centrist alliance was trounced by the far-right National Rally in the recent European Parliament ballot.

Sarkozy, the conservative former president who was in office from 2007 to 2012 and remains an important political figure, said possible chaos triggered by the dissolution of the assembly might be challenging to get out of, according to a report in the Journal du Dimanche.

"Giving the floor to the French people to justify the dissolution is a curious argument since this is precisely what more than 25 million French people have just done at the polls," Sarkozy, who is on friendly terms with Macron, said about the European elections on June 9.

"The risk is great they confirm their anger rather than reverse it."

A poll on Saturday appeared to support his concerns.

The OpinionWay-Vae Solis poll conducted for Les Echos and Radio Classique forecast National Rally would lead in the first round of the parliamentary election with 33 per cent of the vote, ahead of the Popular Front, the alliance of left-wing parties, with 25 per cent.

Macron's centrist camp had 20 per cent.

Thousands marched in Paris and cities across France at the weekend to protest the far-right National Rally ahead of the upcoming elections.